How many worlds exist outside our solar system? @NASA_TESS launched from planet Earth today at 6:51pm ET to hunt for planets around some of the closest & brightest stars. TESS will use 4 cameras to search nearly the entire sky for unknown worlds. More: https://t.co/5hUW3XhaTopic.twitter.com/xuH5q0wqN9

TESS was launched by a SpaceX Falcon 9 rocket aiming for a highly irregular orbit that will stretch all the way to the moon.

It is expected to scan almost the entire night sky over its two year mission, investigating hundreds of thousands of stars between three and 30 million light years away from Earth.

“We are thrilled TESS is on its way to help us discover worlds we have yet to imagine, worlds that could possibly be habitable, or harbour life,” said Thomas Zurbuchen, associate administrator of NASA’s Science Mission Directorate in Washington.

TESS launch from Cape Canaveral, 18-04-2018. Image: SpaceX

The satellite will aim to locate planets that will be studied further by upcoming missions, including the highly anticipated James Webb Space Telescope - due to launch in May 2020.

Mr Zurbuchen said the mission will "help us study the details of these planets" adding that he believes we are "ever the closer to discovering whether we are alone in the universe.”

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